Blender key-map presets

what’s the difference between blender27x and blender key-map

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May i ask in what context? Where did you encounter these two options, cause with no context, i’d say "blender 27x just refers to a blender version 2.7, going up to the latest release of 2.7.9 which is the last update before the major 2.8 update.

Blender key-map refers to a set of hotkeys, or am i missing something?

These two things are not related in the slightest, unless i’ve drastically misunderstood your question.